indexing - How to index mysql table with custom field select -


how can index mysql table according given query?

  select        if(         flag in ('a', 'b')          , status in ('on'),         'a',         flag       ) customized_flag,       if(         agent_group = 'a',         'group_1',         'group_2'       ) group,       count(*) total            mytable     type in (1, 2, 3, 4, 5)        , publish = 1        , status in ('on', 'deleted', 'expired',)      group customized_flag,       agency_package_status ;

flag can a,b,c,d

agent_group can a,b,c,d

type integer number

my sample table data shown below

enter image description here

change to

group customized_flag, `group`

add

index(publish, type, status)

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